Liquid crystal display device

ABSTRACT

According to one embodiment, provide is a liquid crystal display device that suppresses potential change of a common electrode caused by potential change of a signal line. An electrode part is provided on an array substrate so as to surround a display region. A signal line is provided on the array substrate so as to be located in the display region. A passivation film is provided on the array substrate so as to cover at least the signal line and the electrode part. A one-side opening part is provided continuously along an edge part of the display region on the passivation film so that the electrode part is disposed. The common electrode is provided on the array substrate so that a part of the common electrode is located at the one-side opening part and another part of the common electrode is located facing the signal line on the passivation film.

INCORPORATION BY REFERENCE

The present invention claims priority under 35 U.S.C. §119 to JapanesePatent Application No. 2015-015039 filed on Jan. 29, 2015. The contentof the application is incorporated herein by reference in its entirety.

FIELD

Embodiments described herein relate generally to a liquid crystaldisplay device which displays an image in a display region.

BACKGROUND

As a conventional liquid crystal display device, a device having atransverse electric field mode such as an IPS mode is used, which has,for example, pixel electrodes and a common electrode provided on anarray substrate so as to make liquid crystal material fall by using atransverse electric field generated between these pixel electrodes andthe common electrode.

When the common electrode is disposed on the array substrate in thisway, it tends to form parasitic capacitance with respect to a signalline, thus also receiving potential change interlocking with thepotential change of the signal line. Such potential change of the commonelectrode decreases the potential difference between a pixel electrodeand a counter electrode, thereby causing degradation in image qualitydue to insufficient desired brightness obtained at the pixel.

Therefore, the common electrode located on the array substrate isdesired to be insusceptible to the effect of potential change of asignal line.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view illustrating a part of a liquid crystaldisplay device of an embodiment in an enlarged manner.

FIG. 2A is a perspective view schematically illustrating the same liquidcrystal display device.

FIG. 2B is a plan view illustrating a part of a one-side substrate in anenlarged manner.

FIG. 2C is a sectional view schematically illustrating the same liquidcrystal display device.

DETAILED DESCRIPTION

A liquid crystal display device of the embodiment includes a pair ofsubstrates disposed so as to face to each other and a liquid crystallayer disposed between these substrates, and displays an image in adisplay region. The liquid crystal display device includes a conductiveelectrode part, a signal line, a one-side covering layer, a one-sideopening part, a common electrode, an interlayer insulation film, andpixel electrodes. The electrode part is provided on either one of thesubstrates so as to surround the display region. The signal line isprovided on either one of the substrates so as to be at least partiallylocated in the display region, and supplies a video signal. The one-sidecovering layer is provided on either one of the substrates so as tocover at least the signal line and the electrode part. The one-sideopening part is provided on the one-side covering layer so as to makethe electrode part be exposed continuously along the edge part of thedisplay region. The common electrode is provided on either one of thepair of substrates so that a part of the common electrode is located atthe one-side opening part and another part of the common electrode islocated on the one-side covering layer so as to face the signal line.The interlayer insulation film is provided on either one of thesubstrates so as to cover the common electrode. The pixel electrodes areprovided in the display region on the interlayer insulation film oneither one of the substrates, thereby being driven in accordance withthe video signal and forming an electric field to drive the liquidcrystal layer between the pixel electrode and the common electrode.

A configuration of an embodiment will be described with reference todrawings.

In FIG. 1, FIG. 2A and FIG. 2C, reference numeral 11 indicates a liquidcrystal display device. The liquid crystal display device 11 is anactive matrix type liquid crystal panel of a transmissive type thatdisplays an image by transmitting planar light emitted from, forexample, a backlight disposed on the back side thereof, not shown in thedrawings. In this embodiment, the liquid crystal display device 11corresponds to a transverse electric field type such as an IPS mode oran FFS mode.

That is, the liquid crystal display device 11 includes, for example, anarray substrate 15 corresponding to a first substrate as a (one-side)square shape substrate and a counter substrate 16 corresponding to asecond substrate as a (other-side) square shape substrate which aredisposed facing each other. In addition, the liquid crystal displaydevice 11 includes, between these substrates 15 and 16, a liquid crystallayer 17 as an optical modulation layer and a spacer 18 that holds aconstant gap therebetween, and a sealing part 19 as a bonding layer thatbonds the peripheral parts of the substrates 15 and 16. As shown in FIG.1 and FIG. 2A, in a square shape (a rectangular shape) display region 22located in the central area of the liquid crystal display device 11, aplurality of pixels (subpixels) 24 are disposed in a matrix,particularly respectively along a vertical direction (a row direction)corresponding to a first direction shown by an arrow V and a horizontaldirection (a column direction) corresponding to a second directionsubstantially orthogonal to the vertical direction, shown by an arrow H.Moreover, a peripheral region 25 corresponding to a non-display regionis formed in a picture frame shape surrounding the area around thedisplay region 22. In addition, the liquid crystal display device 11includes polarizing plates, not shown in the drawings, attachedrespectively on the display side of the array substrate 15 and on therear (back) side of the counter substrate 16.

The array substrate 15 includes, for example, a glass substrate 27 as afirst substrate body corresponding to a substrate having lighttransmitting properties and insulating properties. On the liquid crystallayer 17 side of the glass substrate 27, a silicon nitride film 28 and asilicon oxide film 29 are formed as undercoat layers. On the siliconoxide film 29, a plurality of scanning lines (gate lines) 31 aredisposed apart from each other along the horizontal direction, while aplurality of signal lines (source lines) 32 are disposed apart from eachother along the vertical direction. The scanning lines 31 and the signallines 32 electrically insulated therebetween are disposed in a latticepattern. Thin film transistors (TFT) 33 respectively corresponding toswitching elements are provided at positions where the scanning lines 31and the signal lines 32 intersect, mostly in the display region 22. Eachof the pixel electrodes 35 constituting each of the pixels 24 and acommon electrode (counter electrode) 36 forming a transverse electricfield to drive the liquid crystal layer 17 cooperating with each of thepixel electrodes 35 are disposed in each of the locations surrounded bythe scanning lines 31 and the signal lines 32 in the display region 22.An alignment film 37 is formed so as to cover the crystal layer 17 sideof the pixel electrode 35. In the peripheral region 25 on the arraysubstrate 15, a conductive electrode part 38 electrically connected tothe common electrode 36, a driving circuit 39 for controlling driving ofeach of the thin film transistors 33 and the like are provided. In orderto provide a clearer description below, the horizontal direction shownby the arrow H is indicated as a left-and-right direction; while thevertical direction shown by the arrow V is indicated as an up-and-downdirection.

The thin film transistors 33 may be of a top gate type, a bottom gatetype, or the like. Using a top gate type transistor as an example in thedescription below, a gate electrode is disposed on the gate insulationfilm that covers an island-shaped semiconductor layer not shown in thedrawings; the gate electrode is covered by a protective film; and asource electrode and a drain electrode are formed on the protectivefilm. In addition, the gate electrode is connected to one of thescanning lines 31 and the source electrode is connected to one of thesignal lines 32. Further, the pixel electrodes 35 respectively formingthe pixels 24 are respectively connected to the drain electrodes. Thethin film transistors 33 are controlled in switching when a signal fromthe driving circuit 39 is applied via the scanning lines 31 to the gateelectrodes, and write the signal respectively in the pixel electrodes 35in accordance with the video signal input via the signal lines 32 fromthe driving circuit 39, thereby turning on/off the pixels 24individually.

Each of the pixel electrodes 35 is formed in a comb tooth shape or thelike by way of film formation and patterning by the use of transparentconductive material, for example, ITO (Indium Tin Oxide) or the like.The pixel electrodes 35 are formed on an interlayer insulation film 41formed of, for example, a silicon nitride film or the like, whichcovers, for example, the common electrode 36 so as to be electricallyinsulated against the common electrode 36.

The common electrode 36 is formed substantially on the whole area of thedisplay region 22 and also partially on the peripheral region 25 by wayof planar film formation and patterning by use of transparent conductivematerial, for example, ITO (Indium Tin Oxide) or the like so as to faceall of the pixel electrodes 35 via the interlayer insulation film 41.The common electrode 36 is formed on a passivation film 43 correspondingto a protective layer as a one-side covering layer that covers, forexample, the signal lines 32 (source electrodes and drain electrodes),so as to cover at least a part of a one-side opening part 44 which isopen in the passivation film 43 (corresponding to the side of thedisplay region 22 in the embodiment), and is electrically connected tothe electrode part 38 exposed at the one-side opening part 44. That is,the common electrode 36 faces the signal lines 32 at least via thepassivation film 43, and forms a parasitic capacitance 46 between thecommon electrode 36 and the signal lines 32. Thus, the one-side openingpart 44 functions as a contact hole for conduction between the commonelectrode 36 and the electrode part 38.

The passivation film 43 corresponds to a first insulation film, forexample, an organic flattening film, which insulates between the commonelectrode 36 and the source electrodes and the like. The passivationfilm 43 is formed from the display region 22 over to the peripheralregion 25, corresponding to substantially the whole area of the arraysubstrate 15. Moreover, a part of the passivation film 43 located at theend part of the array substrate 15 is covered by a part of theinterlayer insulation film 41.

The one-side opening part 44 corresponds to a first groove part formedin a groove shape at a location facing the electrode part 38 of thepassivation film 43. In this embodiment, the one-side opening part 44 isformed continuously in a U-shape at a location apart inward (to the sideof the display region 22) from the outer end part (the outer peripheralpart) of the array substrate 15 on the peripheral region 25 along thelocation of both longer sides 22 a and 22 a and one shorter side 22 b ofthe display region 22. By providing the one-side opening part 44, a partof the electrode part 38 and the silicon oxide film 29 corresponding toa lower layer of the electrode part 38 at the side part on the oppositeside of the display region 22 of the electrode part 38 are both exposed.Moreover, at the one-side opening part 44, the interlayer insulationfilm 41 corresponding to a second insulation film that covers the commonelectrode 36 is disposed, and a (one-side) communication opening part 48which is open in the interlayer insulation film 41 communicates with theone-side opening part 44.

The alignment film 37 is a horizontal alignment film that is formed withsynthetic resin, for example, polyimide or the like so as to cover thewhole area of the liquid crystal layer 17 side of the array substrate15. That is, the alignment film 37 is formed so as to cover the one-sideopening part 44 and the communication opening part 48.

The electrode part 38 corresponds to power feed wiring (bus line)connected to the outside, which sets the common electrode 36 at apredetermined potential, for example, a common potential. Moreover, theelectrode part 38 is formed of a metal such as an aluminum member, forexample, corresponding to a conductive member having electricresistivity similar to that of, for example, the signal lines 32 or thelike and further smaller than that of the common electrode 36, and isdisposed on the same layer as, for example, the signal lines 32. Theelectrode part 38 is disposed continuously in a belt-like U-shape alongthe locations of the both longer sides 22 a and 22 a and one shorterside 22 b of the display region 22, and the inner side thereof (the sideof the display region 22) is covered by the passivation film 43, whilethe outer side thereof is located in the one-side opening part 44.Further, the common electrode 36 is laminated on the outer side (FIG.2B). The alignment film 37, the interlayer insulation film 41 and thelike of the array substrate 15 are omitted in FIG. 2B in order to moreclearly illustrate the arrangement of the common electrode 36, theelectrode part 38 and the one-side opening part 44.

The driving circuit 39 is disposed along the location of the othershorter side 22 b of the display region 22, and is electricallyconnected such as to the signal lines 32 led out from the display region22 to the peripheral region 25, and is also electrically connected to anexternal circuit via a flexible print substrate or the like not shown inthe drawings.

The counter substrate 16 includes a glass substrate 51 as a secondsubstrate body having light transmitting properties, and various layersare laminated sequentially on the glass substrate 51 such as of a colorfilter layer 52 corresponding to a colored layer, an overcoat layer 53corresponding to a flattening layer as the other-side covering layerthat covers the color filter layer 52, an (other-side) alignment film 54for aligning liquid crystal material in the liquid crystal layer 17 orthe like.

The color filter layer 52 includes filter parts, not shown in thedrawings, respectively corresponding to, for example, red, green andblue, disposed at the locations of the pixels 24, and also includes ashielding part (black matrix) 56 that partitions the filter parts toshield unwanted light. The color filter layer 52 may be disposed on thearray substrate 15.

The overcoat layer 53 is formed substantially on the whole area of thecounter substrate 16 so as to cover and make the color filter layer 52flattened. An other-side opening part 58 is formed at a location in theperipheral region 25 on the overcoat layer 53. The other-side openingpart 58 corresponds to a second groove part that is formed in a grooveshape on the array substrate 15 at a location facing the one-sideopening part 44 of the overcoat layer 53. That is, in this embodiment,the other-side opening part 58 is formed continuously in a U-shape inthe peripheral region 25 along the locations of the both longer sides 22a and 22 a and one shorter side 22 b of the display region 22. Moreover,at the other-side opening part 58, the shielding part 56 on the colorfilter layer 52 is partially exposed. Further, the glass substrate 51 ispartially exposed in a state where communication with a (other-side)communication opening part 59 open in the shielding part 56 is provided.

The alignment film 54 is a horizontal alignment film that is formed withsynthetic resin, for example, polyimide or the like, so as to cover thewhole area of the liquid crystal layer 17 side of the counter substrate16. That is, the alignment film 54 is formed so as to cover theother-side opening part 58 and the communication opening part 59.

The liquid crystal layer 17 corresponds to an optical modulation layerformed with predetermined liquid crystal material. The liquid crystallayer 17 is sandwiched by the array substrate 15 and the countersubstrate 16 and is surrounded by the sealing part 19, and the liquidcrystal material constituting the liquid crystal layer 17 is controlledin alignment by the alignment films 37 and 54. The liquid crystalmaterial is driven by the transverse electric field formed between eachof the pixel electrodes 35 and the common electrode 36 so as to rotatethe polarization surface of the light that has been irradiated from abacklight and has then passed through the polarizing plate on the arraysubstrate 15.

The spacer 18 is formed with a member having, for example, lighttransmitting properties on the array substrate 15 in this embodiment.However, the spacer 18 may be formed on the counter substrate 16.

The sealing part 19 is formed by hardening a fluid sealing member thatis cured by ultraviolet (UV) rays or heating, that is, ultravioletcurable resin or thermosetting resin. The sealing part 19 is formed intoa shape surrounding the area around the display region 22, that is, asquare frame shape in this embodiment at a location apart inward fromthe outer edges of both the substrates 15 and 16. At the locations ofthe both longer sides 22 a and 22 a and one shorter side 22 b of thedisplay region 22, the bottom part of the sealing part 19 is located atthe one-side opening part 44 (and the communication opening part 48),and the upper part thereof is located at the other-side opening part 58(and the communication opening part 59). That is, the sealing part 19 isdisposed between the opening parts 44 and 58. Thus, the sealing part 19includes, on the array substrate 15 in the order from the display region22 toward the outer edge part, a bottom first part 19 d 1, a bottomsecond part 19 d 2, and a bottom third part 19 d 3. The bottom firstpart 19 d 1 is located on the silicon nitride film 28, the silicon oxidefilm 29, the electrode part 38, the interlayer insulation film 41 andthe alignment film 37. The bottom second part 19 d 2 is located on thesilicon nitride film 28, the silicon oxide film 29, the interlayerinsulation film 41, and the alignment film 37. The bottom third part 19d 3 is located on the silicon nitride film 28, the silicon oxide film29, and the alignment film 37. Moreover, the sealing part 19 includes,on the counter substrate 16 in the order from the display region 22toward the outer edge part, an upper first part 19 u 1 and an uppersecond part 19 u 2. The upper first part 19 u 1 is located on theshielding part 56 and the alignment film 54 and also above the bottomfirst part 19 d 1 and the bottom second part 19 d 2. The upper secondpart 19 u 2 is located on the alignment film 54 and also above thebottom second part 19 d 2 and the bottom third part 19 d 3. Thus, thesealing part 19 directly bonds the silicon oxide film 29 on the arraysubstrate 15 and the glass substrate 51 on the counter substrate 16 viathe alignment films 37 and 54.

Each of the liquid crystal display devices 11 is made by separatelycutting off from a mother substrate corresponding to a large substratenot shown in the drawings. Thus, the passivation film 43 and theinterlayer insulation film 41 are also laminated on the outer side ofthe sealing part 19 on the end part of the array substrate 15corresponding to the cutting-off region. Moreover, on the correspondinginterlayer insulation film 41, a spacer 61 that is lower in height thanthe spacer 18 disposed in the display region 22 is provided, forexample, with the same material and by the same process as the spacer 18(FIG. 1). Similarly, on the end part of the counter substrate 16corresponding to the cutting-off region, an overcoat layer 62 that ishigher in height (thicker film) than the overcoat layer 53 formed on theshielding part 56 in the display region 22 is provided, for example,with the same material and by the same process as the overcoat layer 53so as to face the spacer 61 (FIG. 1). That is, the overcoat layer 62constitutes a third insulation film, as well as the overcoat layer 53.The overcoat layer 62 constitutes the side face of the other-sideopening part 58. In this embodiment, the spacer 61 and the overcoatlayer 62 are configured to be disposed apart from each other, that is, apart of the sealing part 19 is sandwiched by the spacer 61 and theovercoat layer 62. However, the spacer 61 and the overcoat layer 62 maybe configured to come into contact with each other with the alignmentfilms 37 and 54 sandwiched therebetween and without the sealing part 19disposed therebetween.

On the liquid crystal display device 11, the driving circuit 39 outputsa signal to the scanning lines 31 so as to turn on the thin filmtransistors 33, the gate electrodes of which are electrically connectedto the scanning lines 31, to supply a video signal via the signal lines32. Then, the signal is written to the pixel electrodes 35 of the pixels24, and the liquid crystal material in the liquid crystal layer 17 isdriven by the transverse electric field generated between the pixelelectrodes 35 and the common electrode 36.

In the aforementioned embodiment, the one-side opening part 44 isprovided continuously along the edge part of the display region 22 sothat the electrode part 38 is exposed, thus allowing the commonelectrode 36 to have lower resistance due to reduced contact resistancebetween the common electrode 36 and the electrode part 38. This improvespower supply capability to the common electrode 36 and decreases thepotential change of the common electrode 36, which occurs because ofpotential change of the signal lines 32 and which is caused by theparasitic capacitance 46 between the signal lines 32 and the commonelectrode 36. This prevents degradation in image quality caused byinsufficient writing to the pixel electrodes 35, more specifically, thedegradation in image quality caused such as when the potentialdifference between the pixel electrodes 35 and the common electrode 36is small and thus desired brightness is not obtained. Further, theliquid crystal display device 11 combined with a touch panel allowsnoise on the touch panel reduced. Moreover, the process of manufacturingthe liquid crystal display device is not changed from the process ofmanufacturing conventional devices having a large number of dot-shapedone-side opening parts, thus not increasing cost in manufacturing.

In particular, the formation of a part of the one-side opening part 44along a longer side 22 a of the display region 22 allows the openingarea of the one-side opening part 44, that is, the area of the electrodepart 38 exposed from the one-side opening part 44, to be made wider,thus allowing further reduction of the contact resistance between thecommon electrode 36 and the electrode part 38. Further in thisembodiment, the formation of the one-side opening part 44 continuouslyin a U-shape including the both longer sides 22 a and 22 a and oneshorter side 22 b of the display region 22 allows the opening area ofthe one-side opening part 44, that is, the area of the electrode part 38exposed from the one-side opening part 44, to be made even wider, thusallowing even further reduction of the contact resistance between thecommon electrode 36 and the electrode part 38.

Further, the arrangement of the sealing part 19 so as to be partiallylocated at the one-side opening part 44 on the array substrate 15 andthe other-side opening part 58 on the counter substrate 16 reduces thenumber of layers under the sealing part 19, thus increasing reliabilityand strength of bonding by the sealing part 19, and also suppressingdispersion of the width of the sealing part 19 due to a largerapplication cross-sectional area of the sealing part 19.

In the aforementioned embodiment, the one-side opening part 44 may beformed along at least one longer side 22 a of the display region 22.

Further, the aforementioned liquid crystal display device 11 isdescribed as a transmissive type. However, the aforementioned liquidcrystal display device 11 can also be a reflective type or asemi-transmissive type.

While a certain embodiment of the present invention has heretofore beendescribed, the embodiment has been presented by way of example only andis not intended to limit the scope of the invention. For example, thedisplay device may be an organic EL display device and the like, inplace of the liquid crystal display device. Indeed, the novel embodimentdescribed herein may be embodied in a variety of other forms;furthermore, various omissions, substitutions, and variations may bemade without departing from the spirit of the invention. The appendedclaims and their equivalents are intended to cover the embodiment andits modifications as would fall within the scope and spirit of theinvention.

What is claimed is:
 1. A liquid crystal display device comprising: apair of substrates disposed so as to face to each other; a liquidcrystal layer disposed between the substrates; a conductive electrodepart that is located on one of the substrates so as to surround adisplay region where an image is displayed; a signal line that isprovided on the one of the substrates so as to be at least partiallylocated in the display region, and that supplies a video signal; aone-side covering layer that is provided on the one of the substrates soas to cover at least the signal line and the conductive electrode part;a one-side opening part that is provided continuously along an edge partof the display region on the one-side covering layer so that theconductive electrode part is exposed; a common electrode that isprovided on the one of the substrates so that a part of the commonelectrode is located at the one-side opening part and connected to theconductive electrode part and another part of the common electrode islocated facing the signal line on the one-side covering layer; aninterlayer insulation film that is provided on the one of the substratesso as to cover the common electrode; and a pixel electrode that isprovided in the display region on the interlayer insulation film on theone of the substrates, and that is driven in accordance with the videosignal and also forms between the pixel electrode and the commonelectrode an electric field to drive the liquid crystal layer.
 2. Theliquid crystal display device according to claim 1, wherein the displayregion is formed in a rectangular shape, and the one-side opening partis provided continuously along at least one longer side of the displayregion on the one-side covering layer.
 3. The liquid crystal displaydevice according to claim 2, wherein the one-side opening part isprovided continuously along both longer sides of the display region andeither one of shorter sides of the display region respectively on theone-side covering layer.
 4. The liquid crystal display device accordingto claim 1, comprising a sealing part that bonds the pair of substratesso as to surround the liquid crystal layer, wherein the other of thesubstrates includes; an other-side covering layer; and an other-sideopening part that is provided on the other-side covering layer so as toat least partially face the one-side opening part, and wherein thesealing part is disposed so as to be at least partially located at theone-side opening part and the other-side opening part.
 5. A liquidcrystal display device, comprising: a first substrate; a secondsubstrate disposed so as to face the first substrate; a liquid crystallayer disposed between the first substrate and the second substrate; anda sealing part that bonds the first substrate and the second substrateso as to surround the liquid crystal layer, wherein the first substrateincludes: at least one thin film transistor formed in a display regionwhere an image is displayed; a first insulation film that covers thethin film transistor; a common electrode formed on the first insulationfilm; a second insulation film formed on the common electrode; and apower feed wiring that is formed in a peripheral region surrounding thedisplay region, and that is disposed along an edge part of the displayregion, and wherein the first insulation film has a first groove partformed continuously along the edge part of the display region in theperipheral region, and the common electrode extends from the displayregion to the peripheral region, and is electrically connected to thepower feed wiring at the first groove part.
 6. The liquid crystaldisplay device according to claim 5, wherein the first substrateincludes: a first substrate body; an undercoat layer that covers thefirst substrate body; the power feed wiring formed on the undercoatlayer; the second insulation film that covers the power feed wiring; andan alignment film that covers the second insulation film, and whereinthe first groove part has a first part located on the alignment film. 7.The liquid crystal display device according to claim 5, wherein thefirst substrate includes: a first substrate body; an undercoat layerthat covers the first substrate body; the second insulation film thatcovers the undercoat layer; and an alignment film that covers the secondinsulation film, and wherein the first groove part has a second partlocated on the alignment film.
 8. The liquid crystal display deviceaccording to claim 5, wherein the first substrate includes: a firstsubstrate body; an undercoat layer that covers the first substrate body;and an alignment film that covers the undercoat layer, and wherein thefirst groove part has a third part located on the alignment film.
 9. Theliquid crystal display device according to claim 5, wherein the firstsubstrate includes: a first substrate body; an undercoat layer thatcovers the first substrate body; the power feed wiring formed on theundercoat layer; the second insulation film that covers the power feedwiring and the undercoat layer; and an alignment film that covers thesecond insulation film and the undercoat layer, and wherein the firstgroove part has a first part, a second part and a third part from a sideof the display region to an outer edge part side, the first part beinglocated on the alignment film above the power feed wiring, the secondpart being located on the alignment film above a part of the secondinsulation film that covers the undercoat layer, the third part beinglocated on the alignment film that covers the undercoat layer.
 10. Theliquid crystal display device according to claim 5, wherein the firstgroove part is located between the display region and a part of thefirst insulation film located at an end part of the first substrate inthe peripheral region.
 11. The liquid crystal display device accordingto claim 10, wherein a part of the second insulation film is formed on apart of the first insulation film located at the end part of the firstsubstrate.
 12. The liquid crystal display device according to claim 11,comprising an alignment film partially located on the second insulationfilm formed on a part of the first insulation film.
 13. The liquidcrystal display device according to claim 5, wherein the secondsubstrate includes: a shielding part located in the peripheral region;and a third insulation film located on the shielding part, and whereinthe third insulation film has a second groove part formed at a locationfacing the first groove part.
 14. The liquid crystal display deviceaccording to claim 13, wherein the second substrate includes analignment film that covers the shielding part, and the second grove parthas a first part located on the alignment film.
 15. The liquid crystaldisplay device according to claim 13, wherein the second substrateincludes: a second substrate body; and an alignment film that covers thesecond substrate body, and wherein the second groove part has a secondpart located on the alignment film.
 16. The liquid crystal displaydevice according to claim 13, wherein the second substrate includes: asecond substrate body; the shielding part formed on the second substratebody; and an alignment film formed so as to cover the shielding part andthe second substrate body, and wherein the second groove part has: afirst part located on the alignment film above the shielding part; and asecond part located on the alignment film above a location where thesecond substrate body is covered.
 17. The liquid crystal display deviceaccording to claim 13, wherein the third insulation film partially formsa side face of the second groove part located at an end part of thesecond substrate in the peripheral region.
 18. The liquid crystaldisplay device according to claim 17, wherein a part of the thirdinsulation film is thicker than any other part of the third insulationfilm located in the display region.
 19. The liquid crystal displaydevice according to claim wherein the first substrate includes a spacerat an end part of the first substrate in the peripheral region, andwherein a part of the third insulation film is disposed apart from thespacer.